In what year was "three simultaneous development" first formally put forward as the policy of traditional Chinese opera repertoire?

1960 From April 13 to June 17, the Ministry of Culture held a "Modern Theme Opera Show" in Beijing. Qi Yanming, vice minister of culture, made a clear statement on the reform policy and repertoire policy of traditional Chinese opera in his summary report. "We want to put forward modern drama, traditional drama and new historical drama. Vigorously develop modern drama; Actively arrange, adapt and stage excellent traditional plays; Advocate the creation of new historical dramas from the perspective of historical materialism. " Since then, "three simultaneities" has been formally put forward for the first time as a drama repertoire policy.

The so-called "three stages" means that modern drama, traditional drama and new historical drama keep pace, so it is also called "troika". Traditional drama refers to the traditional drama compiled and circulated in various historical periods before 1949, also known as "traditional drama". How to understand the "essence" and "dross" in tradition has also become the key to the adaptation of traditional plays.